My house is very cold!!

My house is very cold because it was built about 50 years ago. I always feel so cold there for that reason. When it is cold, the outside is warmer than inside. My younger sister and I have a room ourselves. There are two desks, four chairs, a dresser, a shelf, a small table, and a heater in the room. We always study and spend there, but the room is cold. When I am there, my breath become white (mist?). We often quiver without air conditioner heating. (87 words/ 14408 words)